it was unusually hot on the cape today (90+ degrees). Wife let me drive her Disco today and when I hit some traffic in town I got the dreaded transmission be too hot light.

edit>I pulled over and waited some time before hitting the road again. It was only when I was stopped in traffic that the light came on and I pulled over and waited it out again. When I made it to the highway, no sign of the light.

I recently serviced the transmission and put 1000 miles on it without any kind of sign of overheating. Coolant levels look good. I will check the ATF levels and the trans cooler for obstructions. I've also read that the sensors sometime mistakenly sense high resistance but the threads I read on this pertained to Disco I's (is the same true for DII's?)


We see videos of the Discovery driving through hell and the kids are in the back seat looking out the window waving to satan and his minions...so what is the general ambient temperature when you'd expect the transmission to start barking that it's too hot? 90+ degrees is SMOKING to me, so I didn't really blame the transmission for being upset...but realistically it probably shouldn't be upset at 90 degrees.

Insight?

 

90 is not to hot. Check your fluid level first. Your trans temp sensor could be bad.

 

Take your garden hose and back rinse your radiator fins. Spray from inside the hood out to the grill. Dirt, pollen, leaves, etc will reduce the effectivness of your radiator.

 

yeah I didn't think 90 was too hot. I'll check the trans fluid as soon as possible. Main coolant looks good though...despite the fact I've got a pinhole leak somewhere that I haven't been able to find.

CuriousDoes the tranny temp sensor have anything to do whatsoever with the transfercase? Or can I pretty much limit my search to the transmission and its' cooling system?

 

I am 90% sure that the t-case doesnt have any warnings lights, other than for locked or unlocked.
Doubtful that your trans cooler is clogged. Either the level is low or the sensor is bad.

 

Did you fill the tranny by following the Land rover directions. Idle , go trough gears while filling etc...

 

First, go by a tranny shop and see what they show on their scanner. They can read the actual tranny temp when the light is on to determine if it is the tranny or a bad switch/sensor.

 

any special scanner required for this? My company mechanic has a decent scanner. wonder if that will show it.

 

Its 102 here in Austin, Texas and ive never had a problem with over heating of anything. This is still pretty cool compared to the 104 -108 we will see in the dead summer.